clone implementation for Linux/CRIS.

sysdeps/unix/sysv/linux/cris/clone.S

@@ -0,0 +1,88 @@
+/* Copyright (C) 2001 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <sysdep.h>
+#define _ERRNO_H	1
+#include <bits/errno.h>
+
+/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */
+
+	.syntax no_register_prefix
+
+        .text
+ENTRY (__clone)
+	/* Sanity check arguments: No NULL function pointers.  Allow a NULL
+	   stack pointer though; it makes the kernel allocate stack.  */
+	test.d	r10
+	beq	1f
+	nop
+
+	/* We need to muck with a few registers.  */
+	movem	r1,[sp=sp-8]
+
+	/* Save the function pointer and argument.  We can't save them
+	   onto the new stack since it can be NULL.  */
+	move.d	r10,r0
+	move.d	r13,r1
+
+        /* Move the other arguments into place for the system call.  */
+	move.d	r11,r10
+	move.d	r12,r11
+
+	/* Do the system call.  */
+	movu.w	SYS_ify (clone),r9
+	break	13
+	test.d	r10
+	beq	.Lthread_start
+	nop
+
+	/* Jump to error handler if we get (unsigned) -4096 .. 0xffffffff.  */
+	cmps.w	-4096,r10
+	bhs	0f
+	movem	[sp+],r1
+
+	/* In parent, successful return.  (Avoid using "ret" - it's a macro.)  */
+	Ret
+	nop
+
+.Lthread_start:
+	/* Terminate frame pointers here.  */
+	moveq	0,r8
+
+	/* I've told you once.  */
+	move.d	r1,r10
+	jsr	r0
+
+	SETUP_PIC
+	PLTCALL	(_exit)
+
+	/* Die horribly.  */
+	test.d	[6809]
+
+	/* Stop the unstoppable.  */
+9:
+	ba	9b
+	nop
+
+/* Local error handler.  */
+1:
+	movs.w	-EINVAL,r10
+	/* Drop through into the ordinary error handler.  */
+PSEUDO_END (__clone)
+
+weak_alias (__clone, clone)